Merge \"Merge \\\"docs: Migrated \\\"key attestation\\\" page to a new...

Merge \"Merge \\\"docs: Migrated \\\"key attestation\\\" page to a new location (for N OTA).\\\" into nyc-dev am: 6e4d765f am: 1c284523\" into nyc-mr1-dev-plus-aosp
am: fbec3d57

Change-Id: I3950d22b1ffb4c9429df2f5d6b84eab8d1e90dbb